Thread Button Bits: High quality and several thread with various carbide tips like YK05 are available. All products can be developed upon customers' request. Premium designs and steel and premium tungsten carbide insert grade T6 supplied by Boart Long year, Offers industry-leading strength and penetration rates for more productivity, Excellent straightness and hole clean quality, Get max. drilling performance for rock drills with long life to save up fuel cost rate.

CNBM is the largest state-owned enterprise in China building material & equipment industry. Up until October of 2011, our total assets exceeded RMB 190 billion, with 130,000 employees and over 300 subordinate companies. In the year 2012, we are ranked as No. 365 in World Top 500 Enterprises by Fortune, and No. 2 in global building materials industry, second only to Saint-Gobain.

FAQ:

1. Q: Can I get some samples?

A: We are honored to offer you samples for quality check.

2. Q: Do you have the products in stock?

A : Yes , We have sample for several models now could supply to you.

3. Q: What’s the delivery time?

A: It usually takes about 25 days to produce an order. But the exact delivery time might be different for different orders or at different time.

4. Q: Can I mix different models in one container?

A: Yes, different models can be mixed in one container, but the quantity of each model should not be less than MOQ.

5. Q: How does your factory do regarding quality control?

A: Quality is priority. Rock drilling tools workers always attach great importance to quality control from the every beginning to the end of the production. Every product will be fully assembled and carefully tested before it's packed for shipment.

6. Q: Will you deliver the right goods as ordered? How can I trust you?

A: Yes, we will. Our company is world top 500, that is the biggest supplier and manufacture in China, having a good reputation around the world.

7. Q: What's the payment you accept ?

A: As usual our payment is T/T, other payment can consider.

As the largest manufacturer and exporter of building materials in China, we avail ourselves of this opportunity to approach you for mutual-beneficial cooperation.If you want to know more, pls contact me freely.

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Q:Electric hammer drill killed what should take down

Electric hammer drill, is the "two function drill" and "hammer" handheld electric tool, "rotary cutting drill", with the impact of the impact mechanism of driving impact drill bit, drill driven in rotation at the same time, there is a direction perpendicular to the rotation of the rotary drill reciprocating hammer exercise. For concrete, brick, tile, marble and other materials drilling. "Hammer" to drive the impact force of drill rod, used for concrete, bricks and other materials on the slotting, holes or broken concrete etc..

Q:Types of impact drills

There are two kinds of percussion bit, one is double groove, the other is square.

Q:What's the difference between a drill bit and a tap?

A drill is a tool for drilling; a tap is a tool for cutting threads in a hole. That's the difference between them.

Q:What drill is used in stainless iron drilling?. What color?

The best is to make the stainless steel material of cobalt containing material with high speed steel drill, high-speed steel drill is cobalt containing silver, do not know the landlord of the silver white bit is not high speed steel containing cobalt, if not, you can buy only high speed steel cobaltiferous material drill (also called stainless steel special under the best bit), buy imported, not much of your money, the quality difference is too large domestic drill. Or if not, can change the drill bit Ti, Ti is abrasion resistant, average life is 3 times more than the standard twist drill

Q:Angle action and characteristics of standard twist drill

The back angle of the selected point on the main cutting edge of the twist angle alpha Om is expressed by the feed back angle alpha Om in the point column section. The column section is the point m of the main cutting edge, a line parallel to the axis of the drill, and the cylindrical surface formed by the rotation of the line around the center of the bit. The alpha Om changes along the main cutting edge, and the closer to the center, the greater the alpha Om. The back angle of the outer edge of the twist drill is usually 8 to 10 degrees, and the back angle of the transverse blade is 20 to 25 degrees. This can compensate for the influence of the angle of the main cutting edge on the actual working angle of the main cutting edge due to the axial feed motion of the bit, and can adapt to the change of the front angle.

Q:How much is an alloy drill bit?

This need to see what factors such as specifications and brands affect. 10MM, for example, is about 100 of the average.

Q:What are the tools, drills, and any of the machine tools made of?

(1) tungsten cobalt carbide, whose code name is YG, consists of CO and wc. Commonly used brand machine tools, bending strong, not afraid of impact, but hardness and heat resistanceIts characteristics are: good toughness, high bending strength, not afraid of impact, but low hardness and heat resistance. Applicable to the processing of cast iron, bronze and other brittle materialsThe commonly used grades are YG3, YG6, YG8 and so on. The latter figures indicate the percentage of cobalt content. The higher the cobalt content, the better the performance of the impact resistance. Therefore, YG8 is often used in rough machining, and YG6 and YG3 are often used in semi finishing and finishing.(2) tungsten titanium carbide, whose code name is YT, consists of WC (tungsten carbide), Tic (Tan Huatai) and CO (cobalt). Commonly used grades are YTl5, YT30 and so on. Its characteristics are: hardness of 89 ~ 93HRA, heat-resistant temperature of 800~1000 degrees; wear resistance and oxidation resistance are higher; but flexural strength and impact toughness are lower. Suitable for processing carbon steel, alloy steel and other plastic materials.Join titanium carbide can increase the wear resistance of the alloy, alloy and plastic materials can improve the bonding temperature, reduce tool wear, can also increase the hardness; but more brittle, poor toughness, performance under impact is also poor, generally used for processing plastic materials. Common brands are YT5, YT15, YT30, digital is behind the percentage content of titanium carbide, titanium carbide content is higher, the red rigid; but the corresponding cobalt content is lower, the worse the more toughness, impact resistance, so YT5 is commonly used in rough machining, YT15 and YT30 are commonly used in semi finishing and finishing processing.

Q:How do you drill a bit?

Less grinding, first of all, "do not rub", get the drill, that is, grinding, certainly blind grinding. This is a very important step to lay a solid foundation for grinding the next step only when you put a good position before sharpening. The teacher in the demonstration process, according to the methods and skills of practice summed up in simple formulas form explanation and demonstration, students often listen to understand, to do the normal operation demonstration, step by step action demonstration, slow motion model, so that the students easy to accept. Here the use of four formulas to guide the grinding process. Better effect.

Q:The basic angle of twist drill

The front angle is 2, and the front angle is the projection angle of the two main cutting edges on the plane parallel to them. A small sharp angle easily cut workpiece, axial force is small, and the cutting edge length increases, cutting nominal thickness decreases, conducive to heat dissipation and improve tool life; if the front angle is too small, then the bit intensity of deformation increases, the torque is increased, the breakage of the drill bit. Therefore, a reasonable front angle should be sharpened according to the strength and hardness of the workpiece material. The front angle of the standard twist drill is 2 and phi is 118 degrees

Q:M2.5 hit the bottom teeth with much bit

Then, the chip 2.5-0.45=2.05 is used to tap bottom drill bit drilling. If it is an extrusion tap, the formula is 2.5-0.45/2=2.275's drill.